<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
<div class="box">
    <div class="box1">
        <div class="box3"></div>
        <div class="box4"></div>
    </div>
    <div class="box2">
        <div class="box6">
            <div class="box5"></div>
            <div class="box8"></div>
        </div>
        <div class="box7">
            <div class="box9"></div>
            <div class="box10"></div>
        </div>
    </div>
</div>
</body>
<style>
    .box{
        width: 600px;
        height: 200px;
        float: left;
        background: white;
    }
    .box1{
        width: 200px;
        height: 200px;
        float: left;
        background: white;
    }
    .box2{
        width: 400px;
        height: 200px;
        float: left;
        background: white;
    }
    .box6{
        width: 400px;
        height: 100px;
        float: left;
        background: white;
    }
    .box7{
        width: 400px;
        height: 100px;
        float: left;
        background: white;
    }
    .box3{
        width: 200px;
        height: 100px;
        float: left;
        background: red;
    }
    .box4{
       width: 200px;
        height: 100px;
        float: left;
        background: pink; 
    }
    .box5{
        width: 250px;
        height: 100px;
        float: left;
        background: greenyellow; 
    }
    .box8{
        width: 150px;
        height: 100px;
        float: left;
        background: grey;
    }
    .box9{
        width: 150px;
        height: 100px;
        float: left;
        background: yellowgreen;
    }
    .box10{
        width: 250px;
        height: 100px;
        float: left;
        background: yellow;
    }
</style>
</html>
